I'm not aware of any known issue like this. Is there any USB3 device connected at all?
The only sign of a connected device is that one time CAS bit is set. device never reaches enables state (no successful link training), no error, not going to invalid or compliance state either. Just stays in disabled/Disconnected, as if no device is connected. Driver tries everything to enable the device, several resets, warm reset, turns port power off/on, but no reaction. (CAS -Cold Attach Status is set when xHC can't advance the link to the enabled U0 state due to itself being in D3, or because its clocks are not running.) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1878602 Title: When TBT dock is plugged into ICL TBT xHCI, port without device is in CAS state, causes many warm reset fail Status in linux package in Ubuntu: Confirmed Bug description: Since we can't use bugzilla for USB bugs, let's use Launchpad so we can attach dmesg :) System: XPS 9300 ICL Dock: Dell WD19TB Thunderbolt dock Linux: 5.7-rc5 Right after the dock is plugged, [ 127.205823] xhci_hcd 0000:00:0d.0: Get port status 2-1 read: 0x10202a0, return 0x10341 [ 127.205832] usb usb2-port1: status 0341 change 0001 CAS is flagged so warm-reset ensues: [ 127.313467] usb usb2-port1: do warm reset However, it seems nothing is connected to usb2-port1, causes many warm-reset fail, hence this error message: [ 132.158968] usb usb2-port1: Cannot enable. Maybe the USB cable is bad? This issue doesn't happen on CML system with AR/TR TBT controller. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1878602/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
